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Subject[20/39] tty: Fix unbalanced BKL handling in error path

2.6.33-stable review patch. If anyone has any objections, please let us know.

From: Alan Cox <>

commit 77945febbe60a69e9dcab7f49d33a1aa1e436973 upstream.

Arnd noted:

After the "retry_open:" label, we first get the tty_mutex
and then the BKL. However a the end of tty_open, we jump
back to retry_open with the BKL still held. If we run into
this case, the tty_open function will be left with the BKL
still held.

Signed-off-by: Alan Cox <>
Acked-by: Arnd Bergmann <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/char/tty_io.c | 1 +
1 file changed, 1 insertion(+)

--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -1875,6 +1875,7 @@ got_driver:
if (filp->f_op == &hung_up_tty_fops)
filp->f_op = &tty_fops;
+ unlock_kernel();
goto retry_open;

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